I bought this spring kit to go with the MRT bolt for my TM15. After hours of board adjustments and almost a whole case of paint, I still haven't been able to get these to work properly. Even with the stiffest spring the bolt will not return fully. the bolt tip stays in the breach and wont let the next ball fall into place. They do however, work great in my TiPX. I'm up to 4 clips off a co2.
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0 of 1 people found the following review helpful:
I didnt have any luck!! You might!
May 6, 2012
Reviewer:
Omar
from Tucson, AZ United States
Bout the springs thinking that it would really make a difference but it didnt. I adjusted the settings in my marker that were recommended but still no luck. Then again, i am no pro:)
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2 of 6 people found the following review helpful:
Horrible!!!
March 30, 2010
Reviewer:
Juan Magana
from Anaheim, CA United States
I got some of theses from AnsGear, NOT From TechT, when my box got here. I was extremely Excited but when I noticed something.... Rust, used and old.....
Someone had apparently used theses and returned them, and now I have them, the High and Low Springs are extremely in bad condition, but the medium spring was fine but like i said used....
I would recommend buying from TechT spring NOT from AnsGear
undecided 
I didnt have any luck!! You might!